Method of forming valve bags



1930. J. c. REDINGTON METHOD OF'FORMING VALVE BAGS Filed Sept. 17, 1928 Patented. Nov. 4, 1930 UNITED STATES PATENT OFFICE JOHN C. REDm'GTON, OF GENEVA, ILLINOIS, ASSIGNOR, BY MESNE ASSIGNMENTS; TO ST. REG-IS PAPER COMPANY, OF NEW YORK, N. Y., A. CORPORATION OF NEW YORK METHOD OF FORMING VALVE BAGS Application filed September 17, 1928. Serial No. 806,823.

This invention relates to forming a valve bag and more particularly to the method of inserting a sleeve-forming sheet in a valve For some purposes it has been found desirable to insert in the filling valve of a bag a sleeve-forming sheet and, after the bag has been filled, to close the outer end of the sleeve so as to seal the valve 0 ening and completely prevent the escape of material therefrom. In dealing with bags formed of a plurality of relatively movable plies of paper it has been found that the attachment of such a sleeve-forming sheet is apt to be accompanied I by disarrangement of the proper relation of the several plies, which disarran'gement results in a serious weakening of that corner of the bag where the valve is located.

It is the purpose of this invention to provide a method whereby a sleeve-forming sheet may be inserted in the valve of a bag and secured therein expeditiously, cheaply, and without any unnecessary disarrangement of the several plies of paper which may form the bag.

The preferred manner of carrying out this method is illustrated in the accompanying drawings and will be describedin connection therewith.

Figure 1 shows one end of a bag length which is to be formed into a valve bag; Figs. 2, 3 and 4 show successive steps during the tucking in of the valve corner of the bag; Fig. 5 shows the valve corner of the bag with the valve tuckedin' Fig. 6 shows a sleeveforming sheet; Fig. 7 ing sheet .folded ready for placing within the valve; Fig. 8 shows the sleeve placed within the tucked-in valve corner of the bag, and Fig. 9 shows the completed valve corner of the bag with the sleeve in place therein and the end of the bag closed.

In the construction shown, a section of a tube 11, provided with gusset folds 12 and 13, is cut with one corner 14 extending so as to form an extra length at the valve corner. This corner. of the bag is placed inoperative relation witha valve forming device, such as shown somewhat diagrammatically in Figs. 2, 3 and 4. This device comprises a shows the sleeve-fornb,

casing 15, clamps 16 adapted to clamp the gusset fold of the be near one end thereof, spreading members 1 adapted to enter the gusset fold of the bag between the end of the bag and the clamp and to spread apart the gusset fold at 151118 point, and a finger 18 adapted to tuck in the end of the gusset fold between the spread apart sides of the bag. This operation is similar to that disclosed and described in Patent No. 1,682,107, issued to Bates and Dorr August 28, 1928, and need not be further described in this specification.

After the valve has been tucked in by mechanism similar to that disclosed, it assumes an appearance such as indicated in Fig. 5. Thereafter a sheet 19 is provided with adhesive along one side 20 and is folded across its middle portion, as indicated at 21 in Fig. 7.- Thereafter the sheet is slipped into the tucked-in corner of the bag, as indicated in Fig. 8, with the adhesive along edge 20 in contact with the tucked-in edges of the valve flap. Thereafter an end closing seam is formed by providing reinforcing strips 22 and sewing a seam 23 therethrough, or by other analogous means.

From the foregoing, it will be seen that the sleeve-forming sheet 19 is placed in the tucked-in corner of the bag and secured in place therein without disturbing this corner of the bag morethanis necessary to tuck it in to form a valve. valve corner of the bag is not weakened by disarranging the relation of the several plies of paper therein.

The resultant bag is similar to that disclosed in the application of John C. Redin ton for a valve bag and method of closing -t e same, Serial No. 260,436, filed March 9, 1928. No

claim is made herein to subject-matter dis closed in the said application of John C. Redington or the above identified patent to Bates and Dorr.

What I claim is:

1. A method of providing a bag, comprising a plurality of relatively movable walls, with a tucked-in valve and a sleeve in that valve, which comprises first tucking in the corner of the bag to provide a valve,folding a sheet, slipping the sheet between the walls 2 As a consequence the if g I 1,760,796

of the bag at said tucked in eorner with the ends of the sheet parallel with the end of the bag, and thereafter forming an end closure across the ends of the bag and the ends of 3% of bag g mm a co m ing a phra'liyof relativ y movable r alll, with a tucked-in valve and a sleeve in that valve, which comprises first tucking in the 1 corner-ofthe bag-to provide a valve, folding a sheet slipping the sheet between the walls of the a at said tucked in comer with the 7 ends of t e sheet arallel with the end of the .bag, and therea ter adhering the edge of 15 the sheet to the edges of the valve flap formed by: tucking in the corner and forming an end closure across the ends of the bag and the ends of the sheet.

3. A method oiaproviding a be comprising azguaset folde tube formed om a lurality of relatively movable plies, wi a tucked-in yalve'and a sleeveinthat valve, which comprises firsttucking in the corner of the bag to provide a valve, folding a sheet, 5 slipping the sheet between the walls of the bag at said tucked-in corner with the ends of the sheet parallel with the end of the bag, andthereafter formin an end closure across the ends of the bag an the ends of the sheet. 0 4. A method of providing a be comprising a gusset-folded tube formed mm a lurality of relatively movable plies, wi a tucked-in valve .and a sleeve in that valve, which comprises first tucking in the corner 3 of the bag to provide a valve, folding a sheet, slipping the sheet between the walls of the I bag at said tucked-in corner with the ends of the sheet parallel with the end of the bag, and thereafter adhering the edge of the sheet to the edges of the valve flap formed by tucking in the corner and formin an end closure afiross the ends of the bag an the ends of the s set.

In testimony whereof I have hereunto 3 signed my name to this s ecification.

JOHN C. DINGTON. 

